Yeah, I think you're probly right about that, today a co-worker and I were sorta talking about this.
I was saying the paperwork I was working on was so boring, and she telling me basically to go somewhere else more exciting in my head while I was doing it, and I said I can't do that.

My older brother (INTP) is great at that. He and I worked at two different fast-food jobs together (McDonald's and Long John Silver's) and like I was telling her, once he learned how to do the job, he was never there. I mean, he worked hard and did fine, but he was never THERE while he was doing it. Whereas I can sit on the couch or at my desk at work and let my mind wander to other things, but then I'm totally not working at the same time.
So, possibly, N's are better at daydreaming while continuing to function normally? Your heads are just naturally better at brain multi-tasking maybe? I'm just throwin stuff out there, I dunno.